CN101660984B - Sample preparation apparatus of sandy clay triaxial test - Google Patents
Sample preparation apparatus of sandy clay triaxial test Download PDFInfo
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- CN101660984B CN101660984B CN2009101965909A CN200910196590A CN101660984B CN 101660984 B CN101660984 B CN 101660984B CN 2009101965909 A CN2009101965909 A CN 2009101965909A CN 200910196590 A CN200910196590 A CN 200910196590A CN 101660984 B CN101660984 B CN 101660984B
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Abstract
The invention discloses a sample preparation apparatus of a sandy clay triaxial test, comprising a pressure chamber base, a test top cap and a pressure chamber cylinder, wherein the upper end and the lower end of the pressure chamber cylinder are matched with the pressure chamber base and the test top cap; the pressure chamber consists of three circular arc sheets, and moreover, a tightening ring is sheathed on the cylinder so as to cramp the cylinder; the inner wall of each circular arc sheet is provided with a vertical air discharge duct and a transverse air discharge duct; and the middle-lower wall of the cylinder has a suction hole communicated with the vertical air discharge duct and the transverse air discharge duct. The invention has the advantages that air between rubber membranes and the circular arc sheets can be completely discharged, thereby enabling the rubber membranes to cling to the circular arc sheets, and therefore, the surface creasing of a sample is prevented, so that the sample with a smooth and even surface can be prepared; and the sample has the advantages of simple principle and convenient operation. The invention can conveniently prepare samples with different diameters and heights through changing the diameter and the height of a sample tube, thereby satisfying the demands of various tests.
Description
Technical field
The present invention relates to a kind of sand triaxial test sample preparation device in civil engineering work soil test field.
Background technology
Sandy soil does not have stickability and plasticity, but water permeability is strong.Sandy soil layer is good water-bearing zone.Easy densification when making building lot, settling amount is little, but under head and dynamic load effect, bad engineeriing geological phenomenons such as piping and liquefaction may take place in flour sand.The natural compaction rate of sandy soil is the principal element of its engineering properties of control.Therefore, in order to understand the mechanical characteristic of sandy soil, in civil engineering work soil test field, launched great deal of experimental, and obtained a large amount of test results.
In the existing soil test there be the test apparatus commonly used of research sandy soil mechanical characteristic: direct shear apparatus, normal triaxial instrument, moving third-class instrument etc.Triaxial apparatus can react the actual mechanical characteristic of soil more really, can study the mechanical characteristic of soil sample under various conditions.Triaxial test is most important test in laboratory soil test.The preparation of grittiness soil sample is with traditional split cavity or holds the film wound packages prepare the grittiness soil sample in the pressure chamber in the triaxial test process.But be to use traditional split cavity or hold that the grittiness soil sample of film tube preparation is rough, soil sample tilts easily and soil sample is extruded easily.Its reason be rubber membrane and split cavity or and hold between the film tube air arranged, make rubber membrane all not to be close to split cavity or hold on the film tube.
Summary of the invention
Be extruded this deficiency for overcoming inhomogeneous, rough, the easy inclination in surface in dress sample process of grittiness soil sample, the invention provides a kind of sandy soil triaxial test sample preparation device.This sample preparation device simple structure, easy to operate, be easy to grasp, and it is regular to prepare three specimen shapes of sand.
For achieving the above object, the present invention adopts following technical proposals:
One cover sample preparation apparatus of sandy clay triaxial test, comprise cap and pressure chamber's cylinder in pressure chamber's base, the test, shown in the upper and lower side of pressure chamber's cylinder go up cap with described pressure chamber base and test respectively and be complementary, it is characterized in that the cylinder that pressure chamber's cylinder is made up of three arc plates, carry out banding on this cylinder and there is a lock ring to be enclosed within, each arc plate inwall has vertical air discharge duct and transverse row air drain, has a suction hole to connect described vertical vent port and transverse row pore on the middle and lower part cylindrical wall of described cylinder.
Lock ring is made up of a set screw and an annulus with holes among the present invention.
The height of arc plate is 150mm ± 12mm among the present invention, and upper, middle and lower section corresponding thickness is respectively 6mm ± 0.5mm, 8mm ± 0.5mm, 5mm ± 0.5mm.Its corresponding length is respectively 75mm ± 5mm, 45mm ± 4mm, 30mm ± 3mm.Constitute outer crossette and interior crossette from top to bottom, respectively apart from circular arc bottom 30mm ± 3mm and 75mm ± 5mm place.
The internal orifice dimension of suction hole is 3mm among the present invention.Be positioned at the intersection of arc plate bottom transverse air discharge duct and vertical air discharge duct.
The width of arc plate inner transverse air discharge duct is that 3mm ± 0.5mm, the degree of depth are 2mm ± 0.5mm among the present invention, the transverse row air drain be spaced apart 30mm ± 3mm.
Among the present invention, rubber strip is equipped with at three arc plate places of being connected to each other, and realizes sealing.
The present invention compared with prior art has following conspicuous substantive distinguishing features and advantage:
This sample preparation apparatus of sandy clay triaxial test is made up of three arc plates and lock ring, end the gas rubber strip between the arc plate, and arc plate inside is made up of vertical air discharge duct and transverse row air drain.This kind structure of the present invention and split cavity or hold the film tube mutually specific energy rubber membrane and split cavity or hold air emptying between the film tube; make rubber membrane all be close on the arc plate; prepare the regular sand sample of shape; improve the precision of specimen size, and can react the mechanical characteristic of sandy soil more really.The present invention can also make the sample of different-diameter by changing sample preparation device size, satisfies the needs of various sample size, and it is simple to have principle, advantages of simple operation.
Description of drawings
Fig. 1 is the structural representation of one embodiment of the invention.
Fig. 2 is the structural representation of pressure chamber of the present invention cylinder.
Fig. 3 is the A-A place sectional view of Fig. 1.
Fig. 4 is the B-B place sectional view of Fig. 1.
Fig. 5 is the outside drawing of arc plate 2 shown in Figure 2.
Fig. 6 is the interior shape figure of arc plate 2 among Fig. 2.
Fig. 7 is the structural drawing of lock ring among Fig. 2 (4).
Embodiment
A preferred embodiment of the present invention accompanying drawings is as follows: referring to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, this sample preparation apparatus of sandy clay triaxial test comprises cap 17 and pressure chamber's cylinder in pressure chamber's base 14, the test.Pressure chamber's cylinder is made up of arc plate 1,2,3 and lock ring 4.This embodiment is suitable for doing three samples of diameter 61.8mm * high 120mm.Present embodiment can be made different-diameter and sample highly by the height of change arc plate 1,2,3 and the diameter of sample preparation device, to satisfy the needs of various tests.
Above-mentioned arc plate 1,2,3 highly is 150mm ± 12mm, and all there are a vertical air discharge duct 8 and three transverse row air drains 9 in each arc plate inside, and vertical air discharge duct is positioned at the middle part of arc plate 1,2,3, is spaced apart 30mm ± 3mm between the transverse row air drain 9; One suction hole 6 is arranged on the arc plate 2, and suction hole 6 is positioned at the intersection of arc plate 2 bottom transverse air discharge ducts 9 and vertical air discharge duct 8, and the internal orifice dimension of suction hole 6 is 3mm ± 0.5mm, and all the other structures of arc plate 2 are identical with other two arc plates 1,3; Arc plate 1,2,3 has two place's staggered floors to constitute outer crossette and interior crossette 7,10, outer crossette 7 is positioned at apart from arc plate 1,2,3 bottom 75mm ± 5mm places, interior crossette 10 is positioned at apart from 30mm ± 3mm place, arc plate bottom, inside and outside crossette 7,10 vertically is divided into three parts to arc plate 1,2,3: the long 30mm ± 3mm of being in bottom, and thick is 5mm ± 0.5mm; Middle minister is 45mm ± 4mm, and thickness is 8mm ± 0.5mm; Last minister is 75mm ± 5mm, and thickness is 6mm ± 0.5mm.The place, vertical one side of above-mentioned arc plate 1,2,3 is stained with a rubber strip 11, and rubber strip 11 thickness are 1mm, wide 0.3cm.Each arc plate all has a cone-shaped groove 5, and above-mentioned groove 5 degree of depth are 3mm, are used for fixing set screw 12.Above-mentioned lock ring 4 is enclosed within on the arc plate 1,2,3, and on the groove 5 that is fixed on set screw 12 on the arc plate, the internal diameter of lock ring 4 is 75.5mm, and external diameter is 95.5mm, highly is 12mm.Above-mentioned lock ring 4 is positioned at the middle part of arc plate 1,2,3.Above-mentioned lock ring 4 is made of set screw 12 and annulus 13.
Use this sample preparation device, the sample making course of three sand samples is as follows:
1) rubber membrane 16 is enclosed within on pressure chamber's base 14, tightens with bungee;
2) arc plate 1,2,3 tentatively is fixed on successively permeable stone 15 places of pressure chamber's base 14, and crossette 10 contacts with permeable stone 15 in making intact;
3) lock ring ring 13 is enclosed within the top of the outer crossette 7 on the arc plate 1,2,3, and with set screw 12 the fixing banding of arc plate, make the bottom of set screw 12 be positioned at groove 5;
4) top of rubber membrane 16 is enclosed within arc plate 1,2,3 inboards, then air-extractor (for example, vacuum pump) being linked to each other with suction hole 6 to bleed makes rubber membrane be close on the arc plate 1,2,3;
5) the sand layering is packed in the rubber membrane 16;
6) cap 17 is gone up in test and be placed on the sample, stop to bleed, rubber membrane 16 is dug, rubber membrane 16 is pricked the middle part of cap 17 in test with bungee.
Claims (7)
1. sample preparation apparatus of sandy clay triaxial test, comprise pressure chamber's base (14), cap in the test (17) and pressure chamber's cylinder, the upper and lower side of described pressure chamber cylinder respectively with described test on cap (17) and pressure chamber's base (14) be complementary, it is characterized in that pressure chamber's cylinder is by three arc plates (1,2,3) cylinder of Zu Chenging, carry out banding on this cylinder and there is a lock ring (4) to be enclosed within, each arc plate (1,2,3) inwall has vertical air discharge duct (8) and transverse row air drain (9), has a suction hole (6) to connect described vertical air discharge duct (8) and transverse row air drain (9) on the middle and lower part cylindrical wall of described cylinder.
2. sample preparation apparatus of sandy clay triaxial test according to claim 1 is characterized in that: inner vertical air discharge duct (8) of described arc plate (1,2,3) and transverse row air drain (9) are of a size of: wide 3mm ± 0.5mm, dark 2mm ± 0.5mm.
3. sample preparation apparatus of sandy clay triaxial test according to claim 1, it is characterized in that: described transverse row air drain (9) has three, be spaced apart 30mm ± 3mm between each transverse row air drain (9), vertical air discharge duct (8) lays respectively at the middle part of every arc plate (1,2,3).
4. sample preparation apparatus of sandy clay triaxial test according to claim 1, it is characterized in that: described arc plate (1,2,3) highly is 150mm ± 12mm, outer crossette (7) and interior crossette (10) are arranged, outer crossette (7) is positioned at apart from 75mm ± 5mm place, arc plate (1,2,3) bottom, and outer crossette (7) is used to locate lock ring (4); Interior crossette (10) is positioned at apart from 30mm ± 3mm place, arc plate (1,2,3) bottom, and interior crossette (10) can prevent that gas from entering in the sample; Outer crossette (7), interior crossette (10) vertically are divided into three parts to arc plate (1,2,3), wherein, the last minister of arc plate (1,2,3) is 6mm ± 0.5mm for the thickness on 75mm ± 5mm and this top, middle minister is 8mm ± 0.5mm for the thickness at 45mm ± 4mm and this middle part, and following minister is 5mm ± 0.5mm for the thickness of 30mm ± 3mm and this bottom.
5. sample preparation apparatus of sandy clay triaxial test according to claim 1 is characterized in that: described lock ring (4) is to have on one radially that screw revolves the annulus (13) of joining set screw (12); The middle part of described arc plate (1,2,3) has a cone-shaped groove (5) and the top of set screw (12) to match, and the degree of depth is 3mm ± 0.5mm.
6. sample preparation apparatus of sandy clay triaxial test according to claim 1 is characterized in that: described suction hole (6) links to each other with air-extractor, and the aperture is 3mm ± 0.5mm.
7. sample preparation apparatus of sandy clay triaxial test according to claim 1 is characterized in that described three arc plates (1,2,3) place of being connected to each other is equipped with rubber bar (11) and realizes sealing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101965909A CN101660984B (en) | 2009-09-27 | 2009-09-27 | Sample preparation apparatus of sandy clay triaxial test |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101965909A CN101660984B (en) | 2009-09-27 | 2009-09-27 | Sample preparation apparatus of sandy clay triaxial test |
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| CN101660984A CN101660984A (en) | 2010-03-03 |
| CN101660984B true CN101660984B (en) | 2011-10-26 |
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| CN2009101965909A Expired - Fee Related CN101660984B (en) | 2009-09-27 | 2009-09-27 | Sample preparation apparatus of sandy clay triaxial test |
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- 2009-09-27 CN CN2009101965909A patent/CN101660984B/en not_active Expired - Fee Related
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